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The primary source of air pollution is: trash factories automobiles sewage treatment plants
answered
Feb 24, 2018
Biology
high-school
7
votes
93.9k
views
What is the meaning of Como esta usted
answered
Dec 13, 2017
Spanish
middle-school
5
votes
228k
views
What is the path of sperm cells through the male reproductive system? a) testes → epididymis → vas deferens → urethra b) epididymis → testes → urethra → penis c) urethra → testes → epididymis → penis d)
answered
Dec 2, 2017
Biology
high-school
6
votes
68.7k
views
Why were greek coins invented
answered
May 16, 2017
History
middle-school
2
votes
109k
views
What is the circumference of a circle with a radius of 0.8 m? A. 0.64*pi m B. 0.8*pim C. 1.6*pi m D. 2.56*pi m
answered
May 11, 2016
Mathematics
high-school
2
votes
224k
views
What is 0.64 as a fraction
answered
Aug 25, 2015
Mathematics
middle-school
4
votes
89.5k
views
During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were (A) cyanobacteria
answered
Jun 11, 2015
Biology
high-school
6
votes
54.1k
views
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